"Poissons D’or" (from Images, livre deux 1904)

@DeWayfarer Possibly easier to demonstrate than explain, but the treble and middle bass clef would be covered by the right hand, the second bass, left hand. Some of the passages are arpeggios and easiest with the right hand across the length of the keys, similar to a glissando.

@bijouxbroussard as I mentioned my piano knowledge is quite limited. Even a clarinet or guitar such a glissando is not possible. Both are different types of instruments even. Do such on a guitar you get all the half notes in it. And a clarinet, a slide is more a mouth technique than a finger technique. Yet again all the half notes